Skip to Content
Uncategorized

Theoretical Breakthrough for Quantum Cryptography

Quantum cryptography only works if Alice and Bob share their relative positions in advance. Now physicists have worked out how to do it without this information.

The world of cryptography is currently undergoing a quantum revolution. The weird laws of quantum mechanics allow cryptographers to create codes that guarantee perfect secrecy. Until recently, the best cryptographers could aim for was just pretty good secrecy with codes that were always compromised in some way or another. Quantum cryptography, on the other hand, is perfect: theoretically and practically secure.

A few companies have even sprung up to sell the gear that can send perfectly secure messages, mainly to banks and governments (although the gear itself creates some loopholes that eavesdroppers can attack).

But it’s still early days for this technology and naturally it suffers from several drawbacks. For example, one well known limitation is that quantum cryptography can only be used over point-to-point connections and not through networks where data has to be routed. That’s because the routing process destroys the quantum properties of the photons used to secure messages.

A lesser known limitation is that the sender and receiver of quantum encrypted messages–the famous Alice and Bob–must be perfectly aligned so that they can carry out well-defined polarisation measurements on the photons as they arrive. Physicists say that Alice and Bob must share the same reference frame.

That’s not so hard to do when Alice and Bob are both based in labs on the ground. But it’s much harder when one or the other is moving, in a satellite, for example, which would be both spinning and orbiting the Earth.

Today, Anthony Laing from the University of Bristol and a few pals show how to get round this. The trick is to use entangled triplets of photons, so-called qutrits, rather than entangled pairs.

This solves the problem by embedding it in an extra abstract dimension, which is independent of space. So as long as both Alice and Bob know the way in which all these abstract dimensions are related, the third provides a reference against which measurements of the other two can be made.

That allows Alice and Bob to make any measurements they need without having to agree ahead of time on a frame of reference. There is one proviso: Alice and Bob cannot move too quickly during the measurements since this changes their relative orientation and a new qutrit will be needed to establish a reference.

That’ll be useful for quantum encryption over satellite links, the kind of thing that government agencies and the military might want to do. But there’s another, more valuable application.

If quantum encryption is ever to be widely used, it’ll need to work between one microchip and another without the need to share a frame of reference in advance. That’s always been a problem because the chips inside computers are constantly on the move (relative the the wavelength of light) and because photon polarisations drift as they move through optical fibres, introducing another source of error.

That’s why quantum cryptography that is reference frame independent is an enabling technology and so potentially hugely valuable. It means that Laing and co may have made one of the key breakthroughs that will bring quantum cryptography to the masses.

Ref: arxiv.org/abs/1003.1050: Reference Frame Independent Quantum Key Distribution

Update: Anthony Laing writes:

I have a few clarifications which may be useful for your readers…

- The protocol is always bipartite - so two people, two particles,
one particle each.

- The protocol works best for particle dimensions of prime or power-
prime, including the 2 dimensional qubit, so an entangled pair of
qubits is the most simple case that works.

- The protocol works because security is guaranteed with a purity
measure on the joint ‘entangled’ space of Alice and Bob and this
purity would not be reduced too much in a reference frame that varies
slowly on the timescale of rate-of-pair-creation and measurement.


Keep Reading

Most Popular

conceptual illustration showing various women's faces being scanned
conceptual illustration showing various women's faces being scanned

A horrifying new AI app swaps women into porn videos with a click

Deepfake researchers have long feared the day this would arrive.

A view of clouds illuminated by sunlight
A view of clouds illuminated by sunlight

We can’t afford to stop solar geoengineering research

It is the wrong time to take this strategy for combating climate change off the table.

Death and Jeff Bezos
Death and Jeff Bezos

Meet Altos Labs, Silicon Valley’s latest wild bet on living forever

Funders of a deep-pocketed new "rejuvenation" startup are said to include Jeff Bezos and Yuri Milner.

new GPT3 is a good student
new GPT3 is a good student

The new version of GPT-3 is much better behaved (and should be less toxic)

OpenAI has trained its flagship language model to follow instructions, making it spit out less unwanted text—but there's still a way to go.

Stay connected

Illustration by Rose WongIllustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.